You now know he remembers visual communication better, so next time, send a simple text with a few basics, "FYI: talking to new person - more details in person, IF you ask". Come to an agreement that after the initial FYI text you won't be volunteering any additional information unless he asks and is willing to actually listen.

My husband tunes me out when I try to talk to him. We have both had to make changes in the way we try and communicate to keep this from happening. Including me stopping in the middle of a discussion and ask him what he just heard me say. It's a PIA, but I can start to see when he's tuning me out and he makes a better effort not to do it, as he doesn't like getting called out on it.